Structurally Efficient Anisotropic Organized Reticulated structures for Cooling of Electronics and Sensors
Final rept. Jun 2003-Aug 2006
NEVADA UNIV RENO DEPT OF MECHANICAL ENGINEERING
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Anisotropic Organized Reticulated-Filament Structures AORS, consisting of group- interconnected and purposely oriented thermally conductive filaments, can be configured to have wide ranging porosity and a large specific surface area. When deployed as heat exchanger matrices, these structures produce high ntu-values number of transfer units because of the large specific surface area inherent to the media. Examples of structures with the above described characteristics are laminations of orthogonal-weave fine-wire screen, three-filament stacked weaves and box lattice structures. Box lattice structures offer increased design flexibility relative to woven structures since filament cross section shape in addition to filament orientation can be tailored to a specific application. Relative to a box lattice with circular cross section filaments, ellipticity adds surface area to the structure, as well as the possibility to streamline flow through the array. Furthermore, box lattices have superior strength characteristics. Research focuses on characterizing the geometric, thermal and structural attributes of box lattice structures. Geometric models of porosity and specific surface area are developed along with a thermal model of the effective of the effective thermal conductivity. They show that metal fraction can range as 000 - 0.94 dimensionless specific surface area can range as 0.93- 3.14 and dimensionless effective thermal conductivity can range as 0 - 0.78.
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